Gas targeting system for producing radioisotopes

A gas target holder system (100) comprising:

• a body (110), which comprises:
• a cavity (120) configured to contain a target gas to irradiate with a particle beam (F) emitted by a particle accelerator, the cavity (120) comprising at least one portion (121) of frusto-conical shape, a back (122) closing a wide base of the portion of frusto-conical shape and an opening (112), opposite the back relative to the portion of frusto-conical shape, forming an entry in order for at least part of the particle beam to enter the cavity;
• a window (150), positioned facing the entry of the cavity to close the cavity, permeable to protons to enable introduction into the cavity of protons of the particle beam (F) emitted by the particle accelerator, the window comprising a sheet (151) permeable to at least part of the particle beam emitted by the particle accelerator and a support grid (152) configured to withstand pressure differences between an inside of the cavity and an outside of the target holder system, the sheet (151) being positioned between the support grid (152) and the cavity (120);
• a support flange (160) which holds the window (150) and is hermetically secured on the body (110), and which comprises a mechanical fastening interface at an exit from a particle accelerator (170);
• the support flange (160) being furthermore configured to hermetically close the cavity (120) and to at least provide sealing between air outside the target holder system and a cooling fluid flowing in the cooling circuit (130), in addition to providing sealing between a vacuum formed in a beam line of the particle accelerator and a target gas under pressure contained in the cavity (120);
• and
• a cooling circuit comprising
• an inlet,
• a groove in a front surface of the body which faces the support flange, the groove at least partly surrounding the entry of the cavity, and
• a duct comprising a first helical portion formed in a wall of the body surrounding the cavity and extending from the inlet to the back of the cavity
• and a second helical portion formed in a wall of the body surrounding the cavity and extending from the back of the cavity to the outlet,
• wherein coolant circulates from the inlet, into the groove, then the first helical portion and returns to the outlet through the second helical portion and the groove.